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Kernel: Add callback on ".." directory entry for a TmpFS root directory

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Liav A 2022-12-04 10:27:19 +02:00 committed by Andrew Kaster
parent 5ee1758f46
commit 6a555af1f1
Notes: sideshowbarker 2024-07-17 07:20:49 +09:00 
Author: https://github.com/supercomputer7
Commit: https://github.com/SerenityOS/serenity/commit/6a555af1f1
Pull-request: https://github.com/SerenityOS/serenity/pull/16300
Reviewed-by: https://github.com/ADKaster ✅
3 changed files with 23 additions and 9 deletions
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4
Kernel/FileSystem/TmpFS/FileSystem.h
View File

@ -32,7 +32,9 @@ private:
LockRefPtr<TmpFSInode> m_root_inode;
unsigned m_next_inode_index { 1 };
// NOTE: We start by assigning InodeIndex of 2, because 0 is invalid and 1
// is reserved for the root directory inode.
unsigned m_next_inode_index { 2 };
unsigned next_inode_index();
};

25
Kernel/FileSystem/TmpFS/Inode.cpp
View File

@ -18,6 +18,18 @@ TmpFSInode::TmpFSInode(TmpFS& fs, InodeMetadata const& metadata, LockWeakPtr<Tmp
m_metadata.inode = identifier();
}
TmpFSInode::TmpFSInode(TmpFS& fs)
: Inode(fs, 1)
, m_root_directory_inode(true)
{
auto now = kgettimeofday();
m_metadata.inode = identifier();
m_metadata.atime = now;
m_metadata.ctime = now;
m_metadata.mtime = now;
m_metadata.mode = S_IFDIR | S_ISVTX | 0777;
}
TmpFSInode::~TmpFSInode() = default;
ErrorOr<NonnullLockRefPtr<TmpFSInode>> TmpFSInode::try_create(TmpFS& fs, InodeMetadata const& metadata, LockWeakPtr<TmpFSInode> parent)
@ -27,13 +39,7 @@ ErrorOr<NonnullLockRefPtr<TmpFSInode>> TmpFSInode::try_create(TmpFS& fs, InodeMe
ErrorOr<NonnullLockRefPtr<TmpFSInode>> TmpFSInode::try_create_root(TmpFS& fs)
{
InodeMetadata metadata;
auto now = kgettimeofday();
metadata.atime = now;
metadata.ctime = now;
metadata.mtime = now;
metadata.mode = S_IFDIR | S_ISVTX | 0777;
return try_create(fs, metadata, {});
return adopt_nonnull_lock_ref_or_enomem(new (nothrow) TmpFSInode(fs));
}
InodeMetadata TmpFSInode::metadata() const
@ -51,8 +57,11 @@ ErrorOr<void> TmpFSInode::traverse_as_directory(Function<ErrorOr<void>(FileSyste
return ENOTDIR;
TRY(callback({ "."sv, identifier(), 0 }));
if (auto parent = m_parent.strong_ref())
if (m_root_directory_inode) {
TRY(callback({ ".."sv, identifier(), 0 }));
} else if (auto parent = m_parent.strong_ref()) {
TRY(callback({ ".."sv, parent->identifier(), 0 }));
}
for (auto& child : m_children) {
TRY(callback({ child.name->view(), child.inode->identifier(), 0 }));

3
Kernel/FileSystem/TmpFS/Inode.h
View File

@ -38,6 +38,7 @@ public:
private:
TmpFSInode(TmpFS& fs, InodeMetadata const& metadata, LockWeakPtr<TmpFSInode> parent);
explicit TmpFSInode(TmpFS& fs);
static ErrorOr<NonnullLockRefPtr<TmpFSInode>> try_create(TmpFS&, InodeMetadata const& metadata, LockWeakPtr<TmpFSInode> parent);
static ErrorOr<NonnullLockRefPtr<TmpFSInode>> try_create_root(TmpFS&);
@ -84,6 +85,8 @@ private:
NonnullLockRefPtr<Memory::AnonymousVMObject> m_content_buffer_vmobject;
};
bool const m_root_directory_inode { false };
DataBlock::List m_blocks;
Child::List m_children;
};